Process of making vat dyes of the anthracene series.



EaENQiER, ill? UFFENTBACHfilil-THE-MATN, GERMANY, ASSIGNOR TO CORTE'GEATION F QHEMISCHE G-RTESHEIM GEIttMANY.

IELEKTRDN, 0F TRANKFORT-01 T-THE-MAIN,

PROCESS OF MAKTNG VAT EYES OF THE ANTHRACENE SERIEEfi.

ihtlta git.

lie Ibrawing.

In United States Letters Patent Nos.

855248 and 739145 it has been described,

v that aluniinium-chlorid reacts upon 1-amino ianthraquinone and Q-ammoanthraqumone {by heating, whereby vat dyes are formed. T

have found that other derivatives of the anthraquinone containing intact keto groups "of the general formula:

CHHBOQ; wherein R and R mean H, CH Cl, SO H, (3N, CNS, OH, all of which I consider to be equivalents within the scope of this invention, for instance chloroand sulfo-cyanateanthraquinones, the anthraquinone itself and its homologues yield when heated with aluminium-chlorid real vat dyestuffs. Even the sul'fonic acids of the anthraquinone react in "form of their salts with aluminium chlorid producing vat dyes, by which process probably the sulfonic group is split ofl.

The new dyestuffs are distinguished by the following properties. They are black powders, insoluble in water and organic solvents; diflicultly soluble in concentrated sulfuric acid Gb Byielding green to brown solutions; soluble in hot alkaline hydrosul-' fite solutions with orange red to green black color, dyeing cotton very fast gray to brow shades.

The dyestufi s are not identical with the dyestuft' described in German Letters Patent 194.197. The dyestufi obtained from anthraquinone for instance is distinguished from the dyestufi of the said patent by yielding with a solution of sodium sulfid a green vat, from which cotton is dyed gray shades and especially by its tastness agalnst the action of chlorin.

The following examples will serve to illustrate the nature of my invention; parts hein by weight. Y

xample I: 100 parts of anthraquinone are Specification of Lettersfi'atent.

rectly for dyeing purposes.

Patented Nov. it 1W2.

Application filed June 9.20, 1911. Serial No. 634,286.

well ground with 75 parts of Sublimated aluminium chlorid and heated up from 250 to 300 for one hour. The mass melts at 150 C. getting dark and developing hydrochloric acid while forming. The thus obtained black dyestufi-powder can be purified by means of hydrochloric acid or used di- Tt yields with a solution of alkaline hydrosulfite a blackviolet vat, from which cotton is dyed brown shades.

Example II: 100 parts of Q-sulfocyanate- 6 anthraquinone are well ground with 80 parts of sublimz'ited aluminium-chlorid and heated up to 250. The thus obtained dyestuft dissolves in a solution of alkaline hydro suliite with red-brown color. From this vat cotton is dyed bronzebrown shades.

Some of the dyestufis obtainable accord ing to the present process are described in the following table:

Color of the d y es {and powder.

C0101 ofthe Dyes cotvat.

Dyestutf obtained fromton.

Black Black Black Black Anthraquinone Naphthanthraquiuone 1'chloroan thraquinone.

Black-violet. Orange-rcd. Green-black.

Greeirblack.

Brown.

Gray.

R eddishgray.

Re ddishbronzebrown.

B r o n z e brown.

2-ch1oroanthraquinone.

2-sulfocyana te anthraquinone.

Black Red-brown Now what I claim and desire to secure by Letters Patent is the following:

1. The process for the production of vat dyes of the anthracene series consisting in heating derivatives of the anthracene series, containing intact keto groups of the general formula:

wherein R and R mean substituents with anhydrous aluminium chlorid.

2-. As a new article of manufacture the coloring matter of the anthracene series, which can be obtained by treating anthraquinonewith anhydrous aluminium-chlorid, which coloring matter is blackpowder, insoluble in water,caustic soda lye and organic solvents, difiicultly soluble in concentrated sulfuric acid with green color, yield in with alkaline hydrosulfite solution a black-violet vat, -lirom which cotton is dyed bnown' shades fast against the action of presence of two witnesses, this eighth day of ehlorin, diflicultly soluble in sodium sulfid June 1911. solution with green color, from which solution cotton is dyed gray shades fast against FRITZ SENGER 5 the action of chlorin. Witnesses:

In test1mony,that I claim the foregoing as PETER LAU'I'ENBCH KGFB,

my invention, I have signed my name in FRITZ. Dn'xson. 

